The list of May casualties is long. All but one of the 11 S&P 500 groups fell, with real-estate shares getting a boost as the 10-year Treasury yield plunged to a 20-month low. Chipmakers exposed to China got hammered, sending the Philadelphia Semiconductor Index down 17% for its worst month since the financial crisis. Technical support levels cracked as the S&P 500 sank through its 50-, 100- and 200-day moving averages for the first time in months.
The uncertainty is reflected in the options market. While S&P 500 swings have remained relatively subdued this month, the VIX hasn’t bounced around this much since November. In fact, the Cboe Volatility Index spent time both above 21 and below 15 during two different weeks in May, something that’s never happened in the same month, according to data compiled by Twitter user OddStats and Bloomberg.